add ec2 tags

tests/test_ec2/test_tags.py

@@ -0,0 +1,20 @@
+import boto
+from boto.ec2.instance import Reservation, InstanceAttribute
+from sure import expect
+
+from moto import mock_ec2
+
+
+
+@mock_ec2
+def test_instance_launch_and_terminate():
+    conn = boto.connect_ec2('the_key', 'the_secret')
+    reservation = conn.run_instances('<ami-image-id>')
+    instance = reservation.instances[0]
+
+    instance.add_tag("a key", "some value")
+
+    tags = conn.get_all_tags()
+    tag = tags[0]
+    tag.name.should.equal("a key")
+    tag.value.should.equal("some value")